基于非频散信号构建的Lamb波高分辨率损伤成像方法

doi:10.7527/S1000-6893.2013.0125

ACTA AERONAUTICAET ASTRONAUTICA SINICA ›› 2013, Vol. 34 ›› Issue (8): 1815-1823.doi: 10.7527/S1000-6893.2013.0125

• Solid Mechanics and Vehicle Conceptual Design • Previous Articles Next Articles

Lamb Wave High-resolution Damage Imaging Method Based on Non-dispersive Signal Construction

CAI Jian^1,2,3, SHI Lihua², QING Xinlin¹, DU Chaoliang¹

1. Beijing Aeronautical Science and Technology Research Institute, COMAC, Beijing 102211, China;
2. National Key Laboratory on Electromagnetic Environmental Effects and Electro-optical Engineering, PLA University of Science and Technology, Nanjing 210007, China;
3. National Key Laboratory of Mechanics and Control of Mechanical Structures, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China

Received:2012-11-06 Revised:2013-02-19 Online:2013-08-25 Published:2013-03-08
Supported by:
National Natural Science Foundation of China (11172053, 10872217);National High-tech Research and Development Program of China (2012AA040209);Shanghai Postdoctoral Science Foundation (12R21421900)

Abstract

Abstract:

Lamb wave damage imaging is one of the focal research issues in structural health monitoring. However, in practical applications, the imaging resolution is easily affected by the dispersion characteristics of Lamb waves. An dispersion compensation method of non-dispersive signal construction (ND-SC) is studied in this paper to improve Lamb wave imaging resolution. Based on the Lamb wave sensing model established in frequency domain, the theory of ND-SC is analyzed. In addition, the realization of ND-SC is discussed under broadband excitation and narrowband excitation, respectively. Subsequently, associated with the classic delay-and-sum algorithm, a high-resolution damage imaging method is developed. The efficiency of the ND-SC and high-resolution damage imaging methods proposed in this paper is proved by experimental results in an aluminum plate.

Key words: Lamb wave, dispersion compensation, damage imaging, resolution, signal construction

CLC Number:

CAI Jian, SHI Lihua, QING Xinlin, DU Chaoliang. Lamb Wave High-resolution Damage Imaging Method Based on Non-dispersive Signal Construction[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2013, 34(8): 1815-1823.

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Lamb Wave High-resolution Damage Imaging Method Based on Non-dispersive Signal Construction

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